柠檬问题是指买家无法确定产品质量,因此只愿意支付反映平均质量的价格。
INDUSTRY. Lose no time; be always employ’d in something useful; cut off all unnecessary actions.
只要你曾经在一只天鹅蛋里待过,就算你是生在养鸭场里也没有什么关系。
"The only thing necessary for the triumph of evil is for good men to do nothing."